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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 670 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.81² =
  2. 2.29² =
  3. 3.49² =
  4. 4.61² =
  5. 5.21² =
  6. 6.89² =
  7. 7.81² =
  8. 8.89² =
  9. 9.39² =
  10. 10.29² =
  11. 11.91² =
  12. 12.59² =
  13. 13.41² =
  14. 14.51² =
  15. 15.69² =
  16. 16.39² =
  17. 17.89² =
  18. 18.29² =
  19. 19.49² =
  20. 20.19² =
  21. 21.69² =
  22. 22.89² =
  23. 23.21² =
  24. 24.41² =
  25. 25.29² =
  26. 26.49² =
  27. 27.51² =
  28. 28.19² =
  29. 29.91² =
  30. 30.59² =
  31. 31.71² =
  32. 32.41² =
  33. 33.39² =
  34. 34.49² =
  35. 35.39² =
  36. 36.41² =
  37. 37.39² =
  38. 38.49² =
  39. 39.89² =
  40. 40.91² =

Answer key

  1. 6561
  2. 841
  3. 2401
  4. 3721
  5. 441
  6. 7921
  7. 6561
  8. 7921
  9. 1521
  10. 841
  11. 8281
  12. 3481
  13. 1681
  14. 2601
  15. 4761
  16. 1521
  17. 7921
  18. 841
  19. 2401
  20. 361
  21. 4761
  22. 7921
  23. 441
  24. 1681
  25. 841
  26. 2401
  27. 2601
  28. 361
  29. 8281
  30. 3481
  31. 5041
  32. 1681
  33. 1521
  34. 2401
  35. 1521
  36. 1681
  37. 1521
  38. 2401
  39. 7921
  40. 8281

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